MPA 338 BA Bolt Action Rifle


Masterpiece Arms builds World Class Rifles. We start with our industry leading Chassis System, utilize the Best Actions and Triggers produced, and our MPA/Spencer 416R Handlapped Barrels provide some the best shooting, most accurate rifles in existence. Designed, Built and Enhanced by Long Range Shooters and Hunters, our Rifles fulfill the needs of the most discerning shooters.



Please allow 12 to 14 week to build this rifle

SKU: MPA338BA-1-1-2 Category: Tags: , ,

MPA 338BA Rifle

Masterpiece Arms builds ultra precision Bolt Action Rifles. This model, chambered in 338 Lapua, includes the Curtis Helix Action, BA Competition Chassis, 416R Handlapped Barrel with Zero Runout Chamber, MPA DN3 Muzzle Brake, Accurate Metal Magazine and provides a 1/2″ MOA Accuracy Guarantee. This Rifle can successfully engage targets out to a mile (1760 Yards) and beyond with Factory Match Grade Ammo. Handloads can exceed this distance.




  • Curtis Helix Long Action
  • Wire EDM Bolt Lug Raceways
  • 3 Lug Head
  • 60 Degree Bolt Throw
  • Rollerball tipped cocking piece to reduce drag
  • 20 MOA Scope Rail
  • Quick Release Firing Pin Assembly Removal System (Tool Less)
  • Recoil Lugs Ground to .0001″ Flatness and Parallelism
  • Bolt: One Piece Design of the Bolt, Lugs and Handle
  • CNC OD Ground on All critical features and dimensions
  • Spiral Fluting on all Bolts
  • All Bolts are Hand Lapped and Fitted to each individual action
  • DLC Coated
  • Mini 16 Extractor


  • Spencer/MPA Rifle Barrel
  • 416RQ Stainless Steel
  • Precision Gun Drilled, Reamed and Honed
  • Pull Button Rifled
  • Stress Relieved
  • Hand Lapped
  • Bore and Land Inspected on Video Borescope
  • Sheffield Air Gage Inspection to .0001″ on Bore and Rifle Land Variation
  • Chamber is indicated within .0001″ or less – to the bore of the rifle

Chassis System:

  • Masterpiece Arms BA Competition
  • Produced from 6061 Aluminum
  • V-Bedding System with Additional clearance for Glass Bedding Action and Straight Section of Barrel
  • MPA Buttstock with Adjustable Cheek Riser, Length of Pull
  • Ultra Bag Rider – Aluminum Type
  • Night Vision Bridge
  • V4 Spigot Mount (Pic Rail and Arca Swiss Rail)
  • Cerakote Finish – Multiple Colors Available
  • Built In Inclinometer leveling system
  • Enhanced Vertical Grip
  • Thumb Notch
  • R.A.T. System Compatible

Muzzle Brake:

  • MPA DN3 Muzzle Brake
  • Direct Thread Attachment, User index-able (5/8-24 TPI)


  • MPA Trigger (Produced by Bix n Andy Tacsport Pro)
  • (4oz – 2 lbs Pull Range)


  • 1/2″ MOA (3 shot group)

Rifle Case:

  • Plano Basic Rifle Case


  • Total Rifle Weight (13.5 lbs with 26″ M24 Barrel – Does Not Include Ammo, Bipod, Magazine or Optic)
  • Barrel: 416R Stainless Steel, Handlapped
  • Action: Curtis Helix
  • Chamber: Zero Runout Chambering Method
  • Brake: MPA DN3 Muzzle Brake
  • Chassis Type: BA Competition
  • Chassis Material: 6061 Aluminum Billet
  • Chassis Coating: H Series Cerakote
  • Magazine: Accurate Mag AICS 5 Round
  • Chassis Weight: 5.2 lbs
  • Rifle Overall Weight: 13.5 lbs
  • Barrel Profile (Standard) MPA Match Contour (Many other Profiles Available)
  • Barrel Length: 26″
  • Trigger Type:
  • MPA Trigger (Produced by Bix n Andy Tacsport Pro)
  • Adjustable Length of Pull: 13.5-14.5″
  • Cheek Riser: Adjustable
  • Recoil Plate: Adjustable for Height and Cant